Inspection and Verification
- Verify the customer concern by operating the system in question.
- Visually inspect the components listed in the following chart.MECHANICAL ELECTRICAL COMPONENTS SPECIFICATION
Mechanical Electrical - Axle shaft and universal joints
- Driveshaft and universal joints
- Fluid leaks
- Matching tire size
- Battery junction box (BJB) fuses:
- 1 (50A)
- 3 (50A)
- 13 (50A)
- 30 (50A)
- Smart junction box (SJB) fuses:
- 21 (15A)
- 28 (15A)
- 4X4 control module
- Wiring harness
- 4X4 switch
- Gearmotor encoder assembly
- Circuitry
- Connector(s)
- If an obvious cause for an observed concern is found, correct the cause (if possible) before proceeding to the next step.
- If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- Check that the program card is properly installed.
- Check the connections to the vehicle.
- Check the ignition switch position.
- If the diagnostic tool still does not communicate with the vehicle, see the diagnostic tool manual. See MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL - SMART JUNCTION BOX (SJB) .
- Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- CAN or SCP circuit fault; all electronic control units no response/not equipped, See MODULE DOES NOT RESPOND TO THE DIAGNOSTIC TOOL - SMART JUNCTION BOX (SJB) .
- No response/not equipped for the 4X4 control module, See TRANSFER CASE ELECTRONIC SHIFT PINPOINT TEST 2: NO COMMUNICATION WITH THE 4WD CONTROL MODULE .
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the 4X4 module.
- If the DTCs retrieved are related to the concern, See 4X4 Control Module Diagnostic Trouble Code (DTC) Index to continue diagnostics.
- If no DTCs related to the concern are retrieved, See TRANSFER CASE ELECTRONIC SHIFT PINPOINT TEST 1: ELECTRONIC SHIFT FUNCTIONAL TEST .